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Optical Engineering

Radio-over-fiber transport systems with an innovative phase modulation to intensity modulation converter
Author(s): Ching-Hung Chang; Jui-Hsuan Chang
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Paper Abstract

Robust optical phase modulation (PM) schemes have been widely employed in the development of radio-over-fiber (RoF) transport systems. However, the signals produced by these PM schemes require a delay line interferometer (DI), a fiber Bragg grating (FBG), an optical band-pass filter (OBPF), or dedicated dispersive devices to convert them back into the intensity modulation (IM) signal format prior to detection by a photodetector (PD). Inserting a costly DI into a transport link can significantly increase overall cost, and the use of a fixed working window OBPF, FBG, or dedicated dispersive devices to achieve the conversion is inflexible. To overcome these problems in PM-based RoF transport systems, a long-reach RoF link with an innovative PM-to-IM converter is proposed and experimentally demonstrated. Compared with the published PM schemes, the proposed architecture can utilize a vertical-cavity surface-emitting laser (VCSEL) to achieve the same performance of the published PM-to-IM converter at a lower cost. In addition, by adjusting the VCSEL driving current, a tunable range exceeding 350 GHz is experimentally obtained for the converter working window. The proposed long-reach RoF transport system is the first to achieve such PM-to-IM conversion by using a VCSEL and can contribute to the development of RoF transport systems.

Paper Details

Date Published: 13 November 2013
PDF: 7 pages
Opt. Eng. 52(11) 116107 doi: 10.1117/1.OE.52.11.116107
Published in: Optical Engineering Volume 52, Issue 11
Show Author Affiliations
Ching-Hung Chang, National Chiayi Univ. (Taiwan)
Jui-Hsuan Chang, National Chiayi Univ. (Taiwan)

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